All Files Smoothing Drawings The Smooth operation is used to reduce the number of contour points on a brush stroke and center points on a pencil line. It also smooths out the shape. How to smooth drawings In the Tools toolbar, select the Select tool. In the Camera or Drawing view, select the drawing strokes you want to smooth out. Select Drawing > Optimize > Smooth or press Alt + Shift + S. You can also press the Smooth button in the Tool Properties view.